31317291 has 6 divisors (see below), whose sum is σ = 45236100. Its totient is φ = 20878188.

The previous prime is 31317289. The next prime is 31317313. The reversal of 31317291 is 19271313.

It is not a de Polignac number, because 31317291 - 2¹ = 31317289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31317271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1739841 + ... + 1739858.

It is an arithmetic number, because the mean of its divisors is an integer number (7539350).

Almost surely, 2^31317291 is an apocalyptic number.

31317291 is a deficient number, since it is larger than the sum of its proper divisors (13918809).

31317291 is a wasteful number, since it uses less digits than its factorization.

31317291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479705 (or 3479702 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 31317291 is about 5596.1853972148. The cubic root of 31317291 is about 315.2061839844.

The spelling of 31317291 in words is "thirty-one million, three hundred seventeen thousand, two hundred ninety-one".